Vandals went on the rampage in Chorley smashing rows of flower baskets.
Eight barrier baskets, two tubs and several flowerbeds were wrecked by yobs.
Council chiefs estimate the damage at £300 but say it undermines their efforts to spuce up the town.
The flowers were knocked over and the contents strewn across Bengal Street.
Coun Eric Bell, who oversees the floral displays at the council, said: “It’s really disappointing to see people showing a complete disregard to all the hard work that has gone into making the borough look beautiful this summer.
“We get lots of really positive comments from people about how great the displays look and it saddens me that people would want to wreck them in this way.
“It’s just mindless vandalism and we don’t tolerate this type of behaviour in Chorley.”
The mess was cleaned up on but two of the baskets were “unrepairable”.
A taxi driver who was on duty at thetime and said the problem is much worse than just broken flowers.
The man, who did not want to be named, said: “This is where petty crime starts and this is what causes outbursts of riots like we have seen in London, Manchester and Birmingham.
“Our council spends a lot of time and effort making Chorley a nice place, and selfish people ruin it for everyone.”
Anyone who witnessed the vandalism or has information about who was involved should contact the council on 01257 515151 or the police on 0845 1253545.